The other Lightning is a T.5 by the way. It says in W&R 19 the Draken is an ex Danish AF Esk.729, it was also with the same collection at New Waltham and now at Grainthorpe.
Good little collection of aircraft, and well looked after. I believe they used to have an S.55.
James B
Had to be either a 4 or 5 unles it was ex Saudi AF when it would have been a 54 or 55 I think